This auto flusher is now sold by Technical Concepts Autoflush for Tanks. It is $235. http://www.technicalconceptsforless.c...
I have seen it on eBay at times for a lot less sometimes.
I tried CitiKitty for a week or so in September 2013, but it didn't hold enough litter and it was so difficult to clean. The kittens didn't like it and wouldn't use it. I tried various other DIY methods except nothing was really stable and secure enough. In October 2013, I purchased a used Litter Kwittter off eBay. I ended up buying the multicat intermediate rings as well. I also used the thin flexible cutting boards and hot glue to secure a cut out oval shape the size of the whole ring, then making a hole in the middle I would enlarge slowly. I used Better Way Flushible cat litter. A large bowl within the toilet can help catch litter in the beginning when there are large amounts being used.